#define _CRT_SECURE_NO_WARNINGS 1

#include <stdio.h>
#include <stdlib.h>

void Sort(int arr[], int sz)
{
	int i = 0;
	for (i = 0; i < sz - 1; i++)
	{
		int j = 0;
		for (j = 0; j < sz - 1 - i; j++)
		{
			if (arr[j] > arr[j + 1])
			{
				int tmp = 0;
				tmp = arr[j];
				arr[j] = arr[j + 1];
				arr[j + 1] = tmp;
			}
			
		}
	}
}

int main()
{
	int arr[3];
	for (int i = 0; i < 3; i++)
		scanf("%d", &arr[i]);
	int sz = sizeof(arr) / sizeof(arr[0]);
	Sort(arr, sz);
	if (arr[0] + arr[1] <= arr[2])
	{
		printf("Not triangle\n");
		return 0;
	}
	if (arr[0] * arr[0] + arr[1] * arr[1] == arr[2] * arr[2])
		printf("Right triangle\n");
	if (arr[0] * arr[0] + arr[1] * arr[1] > arr[2] * arr[2])
		printf("Acute triangle\n");
	if (arr[0] * arr[0] + arr[1] * arr[1] < arr[2] * arr[2])
		printf("Obtuse triangle\n");
	if (arr[0] == arr[1] || arr[1] == arr[2])
		printf("Isosceles triangle\n");
	if (arr[0] == arr[1] && arr[1] == arr[2])
		printf("Equilateral triangle\n");

	return 0;
}